Juang, K.-W.K.-W.JuangLiou, D.-C.D.-C.LiouDAR-YUAN LEE2018-09-102018-09-102002http://www.scopus.com/inward/record.url?eid=2-s2.0-0036628883&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/298789Site-specific phosphorus management is done to optimize crop production and minimize P loss from soils. The spatial variability of the available P prior to fertilizer application and the P-fixation tendency of soil both need to be taken into account for variable-rate P application. The objectives of this research were to document the spatial variability of the fertilizer-P availability index, which shows the P-fixation tendency, and to develop a strategy that takes the spatial distribution of this index into account for site-specific phosphorus application. In this study, the spatial patterns of the fertilizer-P availability index were characterized by using geostatistics. The ordinary kriging was used for spatial interpolation of the fertilizer-P availability index. Because the fertilizer-P availability index of soil is related to oxalateextractable Fe and Al and because measuring oxalate-extractable Fe and Al is much easier than directly determining the fertilizer-P availability index, the spatial distribution of the fertilizer-P availability index can be obtained using the oxalate-extractable Fe and Al data. The spatial distribution of Olsen-extractable P, which was used to measure the available-P status prior to fertilizer-P application, was also estimated by using ordinary kriging. The required fertilizer-P amounts were then determined using the kriging estimates of the fertilizer-P availability index and Olsen-extractable P. A fertilizer-P recommendation map for the 430-ha study site in Changhua county, Taiwan was generated by using this approach for illustration. The proposed method for generating fertilizer-P recommendation maps can be used for variable-rate application to maintain an adequate P status for crop production and to potentially reduce the P loss from soils.[SDGs]SDG2Cultivation; Interpolation; Soils; Spatial distribution; Phosphate fertilizers; fertilizer; phosphorus; phosphorus; article; crop production; environmental impact assessment; extraction; geostatistical analysis; linear system; regression analysis; research; sampling; soil analysis; soil fertility; agriculture; bioavailability; chemistry; metabolism; microbiology; soil; soil pollutant; Agriculture; Biological Availability; Fertilizers; Phosphorus; Soil; Soil Microbiology; Soil Pollutantsjournal article10.2134/jeq2002.12482-s2.0-0036628883WOS:000176918200021